Gce Model Questions Vol1 2018 Biology Question 50
Practice objective / multiple choice question 50 from the 2018 Gce Model Questions Vol1 Biology examination.
A molecular phylogeny shows three species A, B and C. The branch lengths from their most recent common ancestor are 4 Myr (A), 6 Myr (B) and 5 Myr (C). The molecular clock predicts 2 % sequence divergence per million years. Observed gene‑sequence divergences are: A-B = 20 %, A-C = 22 %, B-C = 18 %. Which pair of species shows a discrepancy between observed divergence and the molecular‑clock expectation, and what is the expected divergence for that pair?
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This is Gce Model Questions Vol1 2018 Biology Question 50. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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